Novel metallic dithiophosphates and their use as additives for lubricating oils
AssigneeOrogil
InventorGeorges Rivier
Life of this patent
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Abstract
Metallic dithiophosphates of the formula: ##STR1## in which R.sub.1 is an alkyl, alkenyl, cycloaliphatic, aryl, or heterocyclic radical, R.sub.2 and R.sub.3 are alkyl radicals, preferably C.sub.1 -C.sub.4 radicals, and m represents the valence of the metal M, M being a metal of Groups IIB, IIIB, IVB, or VIII of the Periodic System of Elements, preferably zinc. They are obtained by the action of P.sub.2 S.sub.5 on a monoester alcohol of the formula: ##STR2## and then by reaction of a metal oxide, such as zinc oxide, with the dithiophosphoric acid formed. These metallic dithiophosphates are useful as extreme-pressure and anti-wear additives for lubricating oils in amounts of between 0.2 and 10 percent, referred to the weight of lubricating oils.
Claims37
A metallic dithiophosphate having the formula:
- ##STR33## in which:
- R.sub.1 represents:
- (a) a linear or branched alkyl radical containing from about 1 to 24 carbon atoms;
- (b) a linear or branched alkenyl radical containing from about 2 to 24 carbon atoms;
- (c) a saturated or unsaturated cycloaliphatic or polycycloaliphatic radical containing from about 3 to 20 carbon atoms;
- (d) an aryl radical containing from 6 to 14 carbon atoms;
- (e) a heterocyclic radical containing one or more heteroelements selected from among nitrogen, sulfur and oxygen;
- R.sub.2 and R.sub.3 are alkyl radicals containing from about 1 to 12 carbon atoms;
- m represents the valence of the metal M;
- M represents a metal of groups IIB, IIIB, IVB, or VIII of the Periodic System of the Elements.
A metallic dithiophosphate having the formula:
- ##STR36## in which:
- R.sub.1 represents:
- (a) a linear or branched alkyl radical containing from about 1 to 24 carbon atoms;
- (b) a linear or branched alkenyl radical containing from about 2 to 24 carbon atoms;
- (c) a saturated or unsaturated cycloaliphatic or polycycloaliphatic radical containing from about 3 to 20 carbon atoms;
- or
- (d) an aryl radical containing from 6 to 14 carbon atoms;
- R.sub.2 and R.sub.3 are alkyl radicals containing from about 1 to 12 carbon atoms;
- m represents the valence of the metal M;
- and
- M represents a metal of groups IIB, IIIB, IVB, or VIII of the Periodic System of the Elements.
Dependencies are inferred from the claim text.